Calculation of basic sound radiation of axisymmetric jets by direct numerical simulations

The influence of various numerical parameters on the computation of the basic radiation of sound from force laminar axisymmetric jets has been studied. Sound radiation is determined by a hybrid method where the hydrodynamic field is derived from an incompressible stream function-vorticity direct numerical simulation. The sound field is obtained from the compact Lighthill and Mohring-Kambe formulations. Ways of improving the acoustic analogies solution are also explored. The structure of the axisymmetric source of radiation has also been investigated for various Reynolds numbers.